Crucible-furnace.



R. EICKWORTH. CRUCIBLE FURNAE. APPLIUATION FILED 111111.11, 1910.

1,054,286, Patented Feb. 25, 1913.

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'STATESPATENT FFICE.

BEGNIER EICKWORTH. OF WITTEN, GERMANY.

CRUCIBLEFURNACE.

Specification of Letters Patent.

Application led March 11, 1910. Serial No. 548,521. y

Patented Feb. 25, 1913.

To all whom t may concern:

Be it known that I, Rnonnm Eiciiwonrn, a subject of the German Emperor,and ree siding at Titten-Ruhr, Germany, have invented certain new anduseful Improvements in Crucible-Furtiaces, of which the following is aspecification.

My invention relates to Crucible-furnaces for chemical smeltingprocesses.

It is well-known that when gas-heated Crucible-furnaces known heretoforeare used for these purposes as for instance, the smelting of bariumnitrate the crucibles readily crack. This is due to the smelting processbeginning too early in the more elevated parts of the Crucible, becausethe thickness of wall there is less than below, and the temperature insuch furnaces is substantially the same at the top and bottom. The gaseswhich are produced subsequently in the bottom part of the Crucible andcan only escape upward with difficulty, then burst the crucible. Inorder to avoid these defects it is necessary to heat the Crucible sothat premature smelting in the upper part of the Crucible is avoided. Ithas been attempted heretofore to remedy the defect of smelt-ingbeginning above by employing Crucibles of special form and supplying theheating gases horizontally to the crucibles. According to my invention,however', I employ the usual form of Crucible, in which lthe thicknessof wall below is very considerably greater than above; accordingly thelower part of the Crucible must first be heated very considerably morehighly than the upper, and only as the smelting process proceeds upwardmay the heating increase there also until at last the Crucible isuniformly heated.

Now a primary object of my invention is to provide a Crucible-furnacewhich satisfies these conditions and thus remedies the disadvantageswhich existed heretofore whenV products of combustion in the upper partwill gradually become greater and only in the course of a certain time,which must be such that it sufiices for the completion of the smeltingprocess, will the heating be more or less uniform. Preferably, I makethe section of thew upper combustion chamber gradually increasingupwardly. The gases generated in the Crucible can be drawn off throughsuitable apertures in the cover.

Some illustrative embodiments of my invention are represented by way ofexample on the accompanying drawings, wherein Figure 1 is a verticalsection through my improved Crucible-furnace according to my invention;and Fig. 2 is a horizontal section on the line A-B in Fig. 1.

Like reference characters designate like parts in all views.

Referring to the drawing, Fig. 1 shows a simple form of furnace in whichthe two superposed heating chambers are separated only by an annularspace one from the other. The Crucible a stands, as usual, on a supportb. T-he fuel gas enters through conduit c and burns in the chamber ebounded by the ring cl and heats the lower part of the crucible. Thering d is spaced from the walls of the Crucible and divides the furnaceinto an upper and a lower chamber. The ring (Z is supported by bracketsupon the walls of the furnace. The products of Combustion pass awaythrough the upper chamber f and the conduits g. The Crucible is Closedby a cover a1 and the furnace by a cover a2, which are provided withregistering openings s, s1 respectively for drawing off the gasesgenerated in the crucible.

I Claimsl. In a Crucible-furnace, arranged to support a Crucibletherein, a refractory ring completely surrounding a portion of theCrucible between its top and bottom, and spaced from the walls of suchCrucible, and means upon the walls of the furnace for supporting saidring, the internal diameter of the ring being substantially less thanthe internal diameter of the furnace-walls.

2. In a Crucible-furnace arranged to sup port a Crucible therein, arefractory ring Completely surrounding the Crucible between its top andbottom and spaced from the walls of such Crucible, two superposedheating-chambers surrounding the Crucible respectively above and belowsaid ring, a In testimony, that I claim the foregoing cover for theCrucible, a cover for the upper as my invention, I havesigned my name inheating-chamber, both covers having regispresence of tWo subseribinWitnesses. tering outlet-openings, a gas-supply flue for REGNIER EICKWRTI-I. [n s.]

5 the lower heating-chamber, and a gas-outlet Witnesses:

flue for the upper enlarged heating-cham- CHAS. J. WRIGHT, ber. OTTOKNIG.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

